Calculate large decimals (more than 15 digits) in Javascript

Question

As we know, Javascript has some issues (or features) with calculating decimal numbers. For example:

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Answer 1

I already answered this in the comment, but here's a demonstration. BigNumber will accept a number in string format for input.

console.log(new BigNumber(0.1).plus("198.43092534959501"));

<script src="https://cdnjs.cloudflare.com/ajax/libs/bignumber.js/6.0.0/bignumber.min.js"></script>